[site] /repl/embed doesn't work with gists

[ConProgramming]

Describe the bug
Looking through site/src/routes/repl/embed.svelte, it looks like the repl embed doesn't work with gists, even though it looks like it should.

This: https://svelte.dev/repl/7f9ca904fc4a4cd09a0e55883a3aa9e5 does work

So this: https://svelte.dev/repl/embed?gist=7f9ca904fc4a4cd09a0e55883a3aa9e5 should too

[Conduitry]

https://github.com/sveltejs/svelte/blob/master/site/src/routes/repl/embed.svelte appears to not have been updated as part of #2572 and is still expecting a response of the form that would be returned by GitHub's Gist API.

[ConProgramming]

@Conduitry Should I look into a fix for this or is possible for this to be a quick fix? I would like to embed the repl in my site

[Conduitry]

Thinking about this more, this doesn't seem like something we want to actually support, at least not while the site is being hosted entirely out of Rich's pocket. Providing a free embeddable REPL sounds like a great way to burn through extra bandwidth, and a great way to get a lot of people angry at us if we decide to change anything or pull the plug on it if it gets too expensive.

/repl/embed is decidedly not part of any API. The only reason it's still around is to provide interactive examples in a couple of blog posts. That's it. It's not intended as a free public service, and I'd favor stripping out the broken code in the component to make its use more clear.

[ConProgramming]

I wasn't aware that he was hosting the site entirely out of his money, so in that case I'd agree. I still think someone should look into making the repl easy to embed self hosted, but that would be a different issue.

[benmccann]

The implementation doesn't rely on gists anymore. We have sveltejs/sites#93 regarding embedding